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为了提高认知无线电系统中频谱感知的性能,对多维联合的频谱感知进行了研究,提出一种时域—码域联合的频谱感知算法。该算法主要利用了直接序列扩频主用户信号频谱空间中时域与码域的特性,分别从时域与码域的角度对信道的状态进行检测,其中时域采用能量感知,码域分析扩频主用户信号的二次功率谱,最终共同确认信道状态。仿真结果表明,联合感知算法对应的检测性能优于单纯时域或码域感知,能够直接应用于直接序列扩频主用户的频谱感知。
In order to improve the performance of spectrum sensing in cognitive radio systems, the spectrum sensing of multidimensional joint is studied, and a time-domain combined spectrum sensing algorithm is proposed. The algorithm mainly uses the characteristics of time domain and code domain in direct spectrum spread spectrum user’s signal spectrum space, and detects the state of channel from the perspective of time domain and code domain, respectively, where the energy domain is adopted in time domain, Frequency of the main user signal secondary power spectrum, and finally together confirm the channel status. The simulation results show that the joint detection algorithm is superior to simple time domain or code domain sensing in detection performance and can be directly applied to spectrum sensing of direct sequence spread spectrum primary users.